The Ōhau River is in the Horowhenua District of New Zealand's North Island.

[1] It flows from the confluence of two short rivers, the North Ōhau River and the South Ōhau River.

The Ōhau initially flows north, turning west to the southeast of Levin.

It reaches the Tasman Sea 10 kilometres (6 mi) southwest of Levin.

This article about a river in Manawatū-Whanganui is a stub.